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From: Michael Bottini <michael.a.bottini@linux.intel.com>
To: rjw@rjwysocki.net, lenb@kernel.org, irenic.rajneesh@gmail.com,
	david.e.box@linux.intel.com, hdegoede@redhat.com,
	mgross@linux.intel.com
Cc: Michael Bottini <michael.a.bottini@linux.intel.com>,
	linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
	platform-driver-x86@vger.kernel.org
Subject: [PATCH 1/2] acpi: Add acpi_init_properties to ACPI driver code
Date: Fri, 23 Jul 2021 13:21:56 -0700	[thread overview]
Message-ID: <20210723202157.2425-1-michael.a.bottini@linux.intel.com> (raw)

Some products in the field, like Intel Rocket Lake systems, contain
AML code that can modify _DSD properties after they have been
evaluated by ACPI init code. Therefore, there is a need for drivers
to be able to reevaluate _DSDs so that the updated property values can
be read. Export acpi_init_properties() for this purpose.

Signed-off-by: Michael Bottini <michael.a.bottini@linux.intel.com>
---
 drivers/acpi/property.c | 1 +
 include/linux/acpi.h    | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index e312ebaed8db..2c1f8cf1a8f0 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -432,6 +432,7 @@ void acpi_init_properties(struct acpi_device *adev)
 	if (!adev->data.pointer)
 		acpi_extract_apple_properties(adev);
 }
+EXPORT_SYMBOL(acpi_init_properties);
 
 static void acpi_destroy_nondev_subnodes(struct list_head *list)
 {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 72e4f7fd268c..57defc3bc9b9 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -716,6 +716,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
 
 int acpi_get_local_address(acpi_handle handle, u32 *addr);
 
+void acpi_init_properties(struct acpi_device *adev);
+
 #else	/* !CONFIG_ACPI */
 
 #define acpi_disabled 1
@@ -976,6 +978,10 @@ static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
 	return -ENODEV;
 }
 
+static inline void acpi_init_properties(struct acpi_device *adev)
+{
+}
+
 #endif	/* !CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
-- 
2.25.1


             reply	other threads:[~2021-07-23 20:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-23 20:21 Michael Bottini [this message]
2021-07-23 20:21 ` [PATCH 2/2] platform/x86/intel/pmc: Add PSON residency counter Michael Bottini
     [not found]   ` <CAHp75Ve2Ls9KVM0KZ2GMgbrQvc6wXvAXP1CqSLzQ4JWMTAcZ0A@mail.gmail.com>
2021-07-24 19:49     ` David E. Box
2021-07-24 20:25       ` Andy Shevchenko
2021-07-24 10:51 ` [PATCH 1/2] acpi: Add acpi_init_properties to ACPI driver code Rafael J. Wysocki
2021-07-28  9:08 ` Hans de Goede
2021-07-28  9:10   ` Hans de Goede
2021-07-28 16:57     ` David E. Box

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